The third part of the Trinity - the Holy Spirit - is not declared as God anywhere in the Bible. And it was declared God in a Creed only in the 5th century (More on the history later). So what do we know about the Holy Spirit from the Scriptures? What is Spirit first of all? And why is it called Holy? What are the influences of the Holy Spirit? What did Jesus say about the Spirit? Alongwith the answers to these questions, let us also study a bit of Greek grammar along the way.